Jessica Simpson Dumped by Tony Romo

Jessica Simpson and Tony Romo have called it quits,Usmagazine.com has confirmed.

A source close to Simpson confirms they broke up the night before her 29th birthday July 10. She was supposed to celebrate with a Ken and Barbie-themed party. (On Simpson's birthday, Romo spent the night at Los Angeles hot spot My House.)

"She canceled her party because of this," the source tells Us. "She's doing OK."

"Barbie party didn't happen, but I turned 29 and feel like I am on top of the world yelling I LOVE GETTING OLDER!" she wrote on her Twitter page Saturday. 

Later, she wrote: "Everyone needs to know that hope floats...grab the strings and pull it back to you... Falling asleep with my mom and the dogs. Please, Lord, give all of my beautiful fans, friends, enemies, and family rest. Bring all of us peace."

A close friend of Romo's tells Us of the split: "It's been a long time coming."

Still, another source tells Us the volatile couple could always get back together. "They go from one fight right into another, without a second break," the source tells Us. "It's always something with Jessica."

Simpson's rep had no comment.